The geological survey information of coal mine is concentrated reflection of "Digital Coal Mine", which is very important basis of the manufacture and management of coal mine.

煤矿地测信息是煤矿地质测量工作的集中反映，是煤矿生产和管理工作的重要依据。

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The error prediction and measure method of holing survey are introduced in detail by holing survey to the No. 2 Well of Chaochuan Coal Mine.

通过对朝川矿二井的贯通测量，详细介绍了贯通测量的误差预计以及贯通测量的施测方法。

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At last, the effectiveness of using integrated geophysical methods to the coal mine gob area survey with specific engineering exploration is proved.

最终，结合具体工程勘查实践，证明了在煤层采空区勘查中采用综合地球物理勘查技术的有效性。

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According to the Colombian Geological Survey (Ingeominas), an accident was reported at the Desespero coal mine.

CNN: Nine feared dead in flooded Colombian coal mine